CONTENTS. 



Page 

 Art. XI. — Restoration of Blastomeryx marshi; by R. S. Lull 



(With Plate III) 159 



Art. XII. — Oregon Tertiary Canida?, with Descriptions of 



New Forms; by M. R. Thorpe 162 



Art. XIII. — The Crystallographic and Atomic Symmetries 



of Ammonium Chloride; by R. W. G. Wtckofp 177 



Art. XIV.— The Crystal Structure of Silver Oxide (Ag a O) ; 



by R. W. G. Wtckoff 184 



Art. XV. — Carboniferous Plants from Peru ; by E. W. Berry 189 



Art. XVI. — Melanovanadite, a New Mineral from Mina Ragra, 

 Pasco, Peru; by W. Lindgren, L. F. Hamilton and 

 C. Palache 195 



A.rt. XVII. — The Ceratopyge Fauna in Western North 



America ; by P. E. Raymond 204 



Art. XVIII.— The Pitts Meteorite; by S. W. McCallie. . . 211 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics.— Yh.<i Reduction of Ferric Salts with Mercury, L. W. 

 McCay and W. T. Anderson, Jr.: Synthetic Gasoline, 216. — The Precipi- 

 tation of Arsenic as Sulphide from Solutions of Arsenates, J. H. Reedy: 

 Colorimetric Analysis, F. D. Snell: Fluid Resistance, C. Wieselsberger, 

 217. — Les Fondaments de la Geometric, H. Poincare, 219. 



Geology and Mineralogy.— J anies Hall of Aibanv, Geologist and Palaeontolo- 

 gist, 1811-1898, J. M. Clarke, 220. — The Problem of the St. Peter 

 Sandstone, C. L. Dake : A Geological Reconnaissance of the Dominican 

 Republic, T. W. Vaugean and others, 221. — A Manual of Seismology, C. 

 Davison, 222. — Earth Evolution and its Facial Expression, W. H. Hobbs: 

 West Virginia Geological Survey, I. C. White, 223. — Virginia Geological 

 Survey. T. L. Watson : Wisconsin Geological and Natural History Sur- 

 vey, W. O. Hotchkiss : Dana's Textbook of Mineralogy. Third Edition, 

 W. E. Ford, 224.— A new Meteoric Iron, 225. 



Miscellaneous Scientific Intelligence. — Carnegie Foundation for the Advance- 

 ment of Teaching, Sixteenth Annual Report of the President, H. S. 

 Pritchett, and Treasurer, R. A. Franks, for the Year ending June 30. 

 1921, 225.— A Monograph of the Existing Crinoids, A. H. Clark, 226.— 

 Source Book for the Economic Geography of North America, C. C. Colby; 

 Ueber die Vorstellungenen der Tiere: ein Beitrag zur Entwicklungsp83 r : 

 chologie, H.Volklet: Le Movement scientifique contemporain en France : 

 1, Les sdences naturelles, G. Matisse, 227. 



